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In a manner similar to that described above, 3,3-bis(chloromethyl) oxetane (155 g, 1 mole) was reacted with 2,2,3,3,4,4,4-heptafluorobutan-1ol (402 g, 2.01 moles) in DMF (2 L) in the presence of sodium hydride (100 g of 50% dispersion in mineral oil, 2.3 moles) at 85° C. for 16 h to give 340 g (70%) of 3,3-bis(2,2,3,3,4,4,4-heptafluorobutoxymethyl) oxetane, a clear, colorless liquid. Glc analysis revealed the purity of this material to be in excess of 99%: BP=70°-72° C./1.0-1.3 mm-hG; 1H NMR (CDCl3) δ 4.44 (s, 4H), 3.97 (t, J=13.2 Hz), 3.86 (s, 4H); 13cNMR δ 43.9, 68.1 (t), 73.5, and 75.6 (Signals from carbons bearing fluorine are not included due to the complex splitting patterns and overlap of signals); 19fNMR δ -81.6 (3 F), -121.0 (2 F) and -128.3 (2 F); Anal. Calcd for C13H12F14O3 : C, 32.4; H, 2.5. Found: C, 32.3; H, 2.3.